implement halt()

1 files changed, 5 insertions, 0 deletions

diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index e15555e..49e61e8 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -1,6 +1,7 @@
 #include "userprog/syscall.h"
 #include <stdio.h>
 #include <syscall-nr.h>
+#include "threads/init.h"
 #include "threads/interrupt.h"
 #include "threads/thread.h"
 
@@ -17,6 +18,10 @@ syscall_handler (struct intr_frame *f UNUSED)
 {
   int syscall_number = *((int *)f->esp);
   switch (syscall_number) {
+    case 0:
+      // halt
+      power_off ();
+      break;
     case 9:
       // printf
       printf ("printf: %s", *((char **)(f->esp+8)));